253997856325 has 6 divisors (see below), whose sum is σ = 314957341874. Its totient is φ = 203198285040.

The previous prime is 253997856319. The next prime is 253997856391. The reversal of 253997856325 is 523658799352.

It is a Cunningham number, because it is equal to 503982²+1.

It can be written as a sum of positive squares in 3 ways, for example, as 1 + 253997856324 = 1^2 + 503982^2 .

It is not a de Polignac number, because 253997856325 - 2⁵ = 253997856293 is a prime.

It is a super-2 number, since 2×253997856325² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5079957102 + ... + 5079957151.

Almost surely, 2^253997856325 is an apocalyptic number.

253997856325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

253997856325 is a deficient number, since it is larger than the sum of its proper divisors (60959485549).

253997856325 is a wasteful number, since it uses less digits than its factorization.

253997856325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10159914263 (or 10159914258 counting only the distinct ones).

The product of its digits is 122472000, while the sum is 64.

The spelling of 253997856325 in words is "two hundred fifty-three billion, nine hundred ninety-seven million, eight hundred fifty-six thousand, three hundred twenty-five".